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intel/rt: fix terminateOnFirstHit handling

Ivan Briano requested to merge ibriano/mesa:intersection into main

What does this MR do and why?

intel/rt: fix terminateOnFirstHit handling

If TraceRay() is called with the TerminateOnFirstHit flag, we need to
terminate the ray on the first confirmed intersection. This is handled
by the lowering of accept_ray_intersection and it's working fine for the
case of multiple instances of the intersection shader being called.

But if the shader calls reportIntersection() more than once, we were
handling them all and accepting the closest one regardless of the flag.

Check for the flag on every confirmed intersection and, if set, accept
it right there. The subsequent lowering will take care of terminating
handling the ray termination if necessary.

Fixes new test dEQP-VK.ray_tracing_pipeline.amber.flags-accept-first

Cc: mesa-stable

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